<template>
  <div :class="className" :style="{height:height,width:width}" ref="container" />
</template>

<script>
  import * as echarts from 'echarts'
  import { ref, nextTick, onMounted, onBeforeUnmount } from "vue";
  
export default {
  props: {
    className: {
      type: String,
      default: 'chart'
    },
    width: {
      type: String,
      default: '100%'
    },
    height: {
      type: String,
      default: '300px'
    }
  },
  
  setup (props, ctx ) {
    let chart = ref(null);
    let container = ref(null);
 
    const initChart = () => {
      chart.value = echarts.init( container.value );
      chart.value.setOption({
        tooltip: {
          trigger: 'item',
          formatter: '{a} <br/>{b} : {c} ({d}%)'
        },
        legend: {
          left: 'center',
          bottom: '10',
          data: ['Industries', 'Technology', 'Forex', 'Gold', 'Forecasts']
        },
        series: [
          {
            name: 'WEEKLY WRITE ARTICLES',
            type: 'pie',
            roseType: 'radius',
            radius: [15, 95],
            center: ['50%', '38%'],
            data: [
              { value: 320, name: 'Industries' },
              { value: 240, name: 'Technology' },
              { value: 149, name: 'Forex' },
              { value: 100, name: 'Gold' },
              { value: 59, name: 'Forecasts' }
            ],
            animationEasing: 'cubicInOut',
            animationDuration: 2600
          }
        ]
      })
    }
    
    onMounted( () => {
      nextTick(() => {
        initChart()
      });
    } )
    onBeforeUnmount( () => {
      if (!chart.value) {
        return
      }
      chart.value.dispose()
      chart.value = null
    } )
    
    return {
      container,
      initChart
    }
  },
}
</script>
